MATLAB: How to create an array of buses from Constant blocks defining the basic structure of the bus

simulink

I am trying to create an array of 100 buses in Simulink. Since I have 100 elements in the array, each element has the same basic structure. I wanted to use a Constant block to specify the basic structure and somehow multiply it by 100 to create an array of structures. The constant block does not have any way to specify its output size, so I need to copy the Constant block 100 times to do this.

Is there any better way of doing it?

Best Answer

It is possible to use a For Each subsystem block to create a bus array with all elements having a pre-defined structure.

Constant blocks describing the structure's fields are used as input to a Bus Creator block inside a For Each subsystem. Then, you use a Signal Specification block to define the output of the For Each subsystem to have a particular dimension (the desired dimensions of your bus array). You use the output signal (with specified dimensions) as a feedback to the For Each subsystem. The For Each subsytem iterates over the dimensions of this feedback signal, copying the basic structure to create a bus array with the desired dimensions.

Refer to the attached example model (CreateBusArray) showing this process. The model also has notes explaning some of the settings necessary to make this work.

The following doc page discusses this approach in detail:

https://www.mathworks.com/help/simulink/ug/combining-buses-into-an-array-of-buses.html

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MATLAB: Rename BUS

Hi,

if you create a sample BUS with the bus editor you can export the BUS in the Model Explorer (Ctrl + H) of your Simulink Model (Base Workspace). It will generate an .m-file where you can set the bus names and run on model startup:

% -------------------------------------------------------------------

%  MATLAB file generated by Simulink.saveVars 
% -------------------------------------------------------------------
FA = Simulink.Bus;
FA.Description = '';
FA.DataScope = 'Auto';
FA.HeaderFile = '';
saveVarsTmp{1} = Simulink.BusElement;
saveVarsTmp{1}.Name = 'cog';
saveVarsTmp{1}.DataType = 'double';
saveVarsTmp{1}.Complexity = 'real';
saveVarsTmp{1}.Dimensions = 1;
saveVarsTmp{1}.DimensionsMode = 'Fixed';
saveVarsTmp{1}.SamplingMode = 'Sample based';
saveVarsTmp{1}.SampleTime = -1;
saveVarsTmp{1}(2, 1) = Simulink.BusElement;
saveVarsTmp{1}(2, 1).Name = 'mass';
saveVarsTmp{1}(2, 1).DataType = 'double';
saveVarsTmp{1}(2, 1).Complexity = 'real';
saveVarsTmp{1}(2, 1).Dimensions = 1;
saveVarsTmp{1}(2, 1).DimensionsMode = 'Fixed';
saveVarsTmp{1}(2, 1).SamplingMode = 'Sample based';
saveVarsTmp{1}(2, 1).SampleTime = -1;
FA.Elements = saveVarsTmp{1};
clear saveVarsTmp;

Regards, Andreas

MATLAB: What is the criterion for being able to select individual elements from an input signal to the Bus Creator block in Simulink

When a signal is attached directly from a Mux block to a Bus Creator block, the Bus Creator block is able to determine what signals went into the Mux block in order to produce the resulting signal. This is because the Mux block is a virtual block. It is this property that allows the Bus Creator to choose specific elements of the vector input.

When the Mux block output is sent through a Gain block before being sent to the Bus Creator, the Bus Creator can no longer pick specific elements of that signal because the Gain block is not a virtual block. If you want the Bus Creator block to pick specific elements of the signal, consider using a Selector block or Demux block to separate the elements into different signals again, then Mux the signals again.

Best Answer

Related Solutions

MATLAB: Rename BUS

MATLAB: What is the criterion for being able to select individual elements from an input signal to the Bus Creator block in Simulink

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